package com.cy.pj.sys.service.realm;

import com.cy.pj.sys.dao.SysUserDao;
import com.cy.pj.sys.pojo.SysUser;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;

//创建一个Realm类型的实现类(基于此类通过DAO访问数据库)
public class ShiroUserRealm  extends AuthorizingRealm {
    @Autowired
    private SysUserDao sysUserDao;
    /**
     * 设置凭证匹配器(与用户添加操作使用相同的加密算法)
     */
    @Override
    public void setCredentialsMatcher(
            CredentialsMatcher credentialsMatcher) {
        //构建凭证匹配对象
        HashedCredentialsMatcher cMatcher=
                new HashedCredentialsMatcher();
        //设置加密算法
        cMatcher.setHashAlgorithmName("MD5");
        //设置加密次数
        cMatcher.setHashIterations(1);
        super.setCredentialsMatcher(cMatcher);
    }
    /*负责获取并封装授权信息*/
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(
            PrincipalCollection principalCollection) {
        return null;
    }
    /**
     * 通过此方法完成认证数据的获取及封装,系统
     * 底层会将认证数据传递认证管理器，由认证
     * 管理器完成认证操作。
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(
            AuthenticationToken token) throws AuthenticationException {
        //1.获取用户名(用户页面输入)
        UsernamePasswordToken upToken=
                (UsernamePasswordToken)token;
        String username=upToken.getUsername();
        //2.基于用户名查询用户信息
        SysUser user=
                sysUserDao.findUserByUserName(username);
        //3.判定用户是否存在
        if(user==null)
            throw new UnknownAccountException();
        //4.判定用户是否已被禁用。
        if(user.getValid()==0)
            throw new LockedAccountException();
        //5.封装用户信息
        ByteSource credentialsSalt=
                ByteSource.Util.bytes(user.getSalt());
        //记住：构建什么对象要看方法的返回值
        SimpleAuthenticationInfo info=new SimpleAuthenticationInfo(
                user,//principal (身份)
                user.getPassword(),//hashedCredentials
                credentialsSalt, //credentialsSalt
                getName());//realName
        //6.返回封装结果
        return info;//返回值会传递给认证管理器(后续
        //认证管理器会通过此信息完成认证操作) }
    }
}
